Android实现文件上传功能（接收端用strust2）

首先是Android端的上传工具类：

/**
 * 本类可以完成一个或多个文件的提交。 结构非常简单直接看代码就可以了。
 * 
 * @author janken
 */
public class FileUpload {
    /**
     * 提交文件的地址.
     */
    private String url = null;
    /**
     * 要提交的文件.
     */
    private List<File> files = null;

    /**
     * 构造方法。
     * 
     * @param url
     *            这个URL必须是get提交方式的URL，即这个URL不能带有任何参数信息。eg：'http://localhost:8080/FileUploadServer/file/upload.do'
     */
    public FileUpload(String url) {
        this.url = url;
        files = new ArrayList<File>();

    }

    /**
     * 通过这个方法来添加要提交的文件。
     * 
     * 
     * @param file
     *            提交的文件,如果文件为空或者不存在或者不可读，则不提交这个文件，重复的文件只提交一次。
     */
    public void addFile(File file) {
        if (file == null || !file.exists() || !file.canRead()) {
            return;
        } else {
            for (int i = 0; i < files.size(); i++) {
                if (file.getPath().equalsIgnoreCase(files.get(i).getPath())) {
                    return;
                }
            }
            files.add(file);
        }
    }

    /**
     * 提交的方法，该方法为每个文件创建一个请求连接进行提交。
     * 
     * @throws Exception
     */
    public void upload() throws Exception {
        for (int i = 0; i < files.size(); i++) {
            HttpClient httpClient = new DefaultHttpClient();
            try {
                FileEntity entity = new FileEntity(files.get(i),
                        "binary/octet-stream");
                StringBuilder curUrl = new StringBuilder(url);
                curUrl.append("?fileName=" + files.get(i).getName());
                HttpPost httppost = new HttpPost(curUrl.toString());
                httppost.setEntity(entity);

                HttpResponse response = httpClient.execute(httppost);
                int resultCode = response.getStatusLine().getStatusCode();
                if (resultCode != HttpStatus.SC_OK) {
                    throw new Exception("上传文件" + files.get(i).getPath()
                            + "失败.错误代码是：" + resultCode + ";原因描述是："
                            + response.getStatusLine().getReasonPhrase());
                }
            } finally {
                if (httpClient != null
                        && httpClient.getConnectionManager() != null) {
                    httpClient.getConnectionManager().shutdown();
                }
            }
        }
    }
}

　下面是Struts2的代码，框架的搭建这里就不再细述了，只说下struts.xml中的action的配置：

 <package name="upload" namespace="/file" extends="json-default">
        <action name="upload" class="cn.self.janken.util.file.upload.action.UploadFileAction"
            method="uploadFile">
            <interceptor-ref name="fileUpload">
                <!-- 配置允许上传的文件类型，多个用","分隔 -->
                <!-- 3gp,avi,bmp,(jpg\jpeg),mp4,wav -->
                <param name="allowedTypes">
                    video/3gpp,video/x-msvideo,application/x-MS-bmp,image/jpeg,video/mp4,audio/x-wav
                </param>
                <!-- 配置允许上传的文件大小，单位字节 100M -->
                <param name="maximumSize">100000000</param>
            </interceptor-ref>
            <interceptor-ref name="defaultStack" />
            <param name="savePath">/upload</param>
            <result type="json">
                <param name="root">result</param>
            </result>
        </action>
    </package>

• action的name属性是请求时.do前边的内容，本例中请求时要用upload.do;后边的do是可以在web中配置的的，有的人用.action等的字符串。
• package的namespace属性是请求时在url中指定请求的路径使用，本例中用的是file，……/FileUploadServer/file/upload.do（即斜粗体的部分）。

action的代码如下：

public class UploadFileAction extends ActionSupport {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    private String result = null;
    private String fileName = null;
    private String savePath = null;

    public String getResult() {
        return result;
    }

    public void setFileName(String fileName) {
        this.fileName = fileName;
    }

    public void setSavePath(String savePath) {
        this.savePath = savePath;
    }

    public String uploadFile() throws Exception {
        ActionContext context = ActionContext.getContext();
        HttpServletRequest request = (HttpServletRequest) context
                .get(ServletActionContext.HTTP_REQUEST);
        CoyoteInputStream cis = (CoyoteInputStream) request.getInputStream();
        String realPath = ServletActionContext.getServletContext().getRealPath(
                savePath);

        File dir = new File(realPath);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        File file = new File(dir, fileName);
        file.deleteOnExit();
        file.createNewFile();

        BufferedInputStream inBuff = null;
        FileOutputStream output = null;
        BufferedOutputStream outBuff = null;
        try {
            inBuff = new BufferedInputStream(cis);
            output = new FileOutputStream(file);
            outBuff = new BufferedOutputStream(output);

            // 缓冲数组
            byte[] b = new byte[1024 * 8];
            int len;
            while ((len = inBuff.read(b)) != -1) {
                outBuff.write(b, 0, len);
            }
            outBuff.flush();
            result = "OK";
            return SUCCESS;
        } finally {
            if (inBuff != null) {
                inBuff.close();
            }
            if (output != null) {
                output.close();
            }
            if (outBuff != null) {
                outBuff.close();
            }
        }
    }
}

　　其中有3个属性，fileName是通过url传递过来的；result是用于请求的返回的告诉请求端处理是否完成；savePath是在action的xml中配置的一个参数，用来指定文件保存的文件夹

附录 ：allowedTypes的类型对照如下：

•  application/octet-stream(无限制)
• 其他：

3gp	video/3gpp	aab	application/x-authoware-bin	aam	application/x-authoware-map
aas	application/x-authoware-seg	ai	application/postscript	aif	audio/x-aiff
aifc	audio/x-aiff	aiff	audio/x-aiff	als	audio/X-Alpha5
amc	application/x-mpeg	ani	application/octet-stream	asc	text/plain
asd	application/astound	asf	video/x-ms-asf	asn	application/astound
asp	application/x-asap	asx	video/x-ms-asf	au	audio/basic
avb	application/octet-stream	avi	video/x-msvideo	awb	audio/amr-wb
bcpio	application/x-bcpio	bin	application/octet-stream	bld	application/bld
bld2	application/bld2	bmp	application/x-MS-bmp	bpk	application/octet-stream
bz2	application/x-bzip2	cal	image/x-cals	ccn	application/x-cnc
cco	application/x-cocoa	cdf	application/x-netcdf	cgi	magnus-internal/cgi
chat	application/x-chat	class	application/octet-stream	clp	application/x-msclip
cmx	application/x-cmx	co	application/x-cult3d-object	cod	image/cis-cod
cpio	application/x-cpio	cpt	application/mac-compactpro	crd	application/x-mscardfile
csh	application/x-csh	csm	chemical/x-csml	csml	chemical/x-csml
css	text/css	cur	application/octet-stream	dcm	x-lml/x-evm
dcr	application/x-director	dcx	image/x-dcx	dhtml	text/html
dir	application/x-director	dll	application/octet-stream	dmg	application/octet-stream
dms	application/octet-stream	doc	application/msword	dot	application/x-dot
dvi	application/x-dvi	dwf	drawing/x-dwf	dwg	application/x-autocad
dxf	application/x-autocad	dxr	application/x-director	ebk	application/x-expandedbook
emb	chemical/x-embl-dl-nucleotide	embl	chemical/x-embl-dl-nucleotide	eps	application/postscript
eri	image/x-eri	es	audio/echospeech	esl	audio/echospeech
etc	application/x-earthtime	etx	text/x-setext	evm	x-lml/x-evm
evy	application/x-envoy	exe	application/octet-stream	fh4	image/x-freehand
fh5	image/x-freehand	fhc	image/x-freehand	fif	image/fif
fm	application/x-maker	fpx	image/x-fpx	fvi	video/isivideo
gau	chemical/x-gaussian-input	gca	application/x-gca-compressed	gdb	x-lml/x-gdb
gif	image/gif	gps	application/x-gps	gtar	application/x-gtar
gz	application/x-gzip	hdf	application/x-hdf	hdm	text/x-hdml
hdml	text/x-hdml	hlp	application/winhlp	hqx	application/mac-binhex40
htm	text/html	html	text/html	hts	text/html
ice	x-conference/x-cooltalk	ico	application/octet-stream	ief	image/ief
ifm	image/gif	ifs	image/ifs	imy	audio/melody
ins	application/x-NET-Install	ips	application/x-ipscript	ipx	application/x-ipix
it	audio/x-mod	itz	audio/x-mod	ivr	i-world/i-vrml
j2k	image/j2k	jad	text/vnd.sun.j2me.app-descriptor	jam	application/x-jam
jar	application/java-archive	jnlp	application/x-java-jnlp-file	jpe	image/jpeg
jpeg	image/jpeg	jpg	image/jpeg	jpz	image/jpeg
js	application/x-javascript	jwc	application/jwc	kjx	application/x-kjx
lak	x-lml/x-lak	latex	application/x-latex	lcc	application/fastman
lcl	application/x-digitalloca	lcr	application/x-digitalloca	lgh	application/lgh
lha	application/octet-stream	lml	x-lml/x-lml	lmlpack	x-lml/x-lmlpack
lsf	video/x-ms-asf	lsx	video/x-ms-asf	lzh	application/x-lzh
m13	application/x-msmediaview	m14	application/x-msmediaview	m15	audio/x-mod
m3u	audio/x-mpegurl	m3url	audio/x-mpegurl	ma1	audio/ma1
ma2	audio/ma2	ma3	audio/ma3	ma5	audio/ma5
man	application/x-troff-man	map	magnus-internal/imagemap	mbd	application/mbedlet
mct	application/x-mascot	mdb	application/x-msaccess	mdz	audio/x-mod
me	application/x-troff-me	mel	text/x-vmel	mi	application/x-mif
mid	audio/midi	midi	audio/midi	mif	application/x-mif
mil	image/x-cals	mio	audio/x-mio	mmf	application/x-skt-lbs
mng	video/x-mng	mny	application/x-msmoney	moc	application/x-mocha
mocha	application/x-mocha	mod	audio/x-mod	mof	application/x-yumekara
mol	chemical/x-mdl-molfile	mop	chemical/x-mopac-input	mov	video/quicktime
movie	video/x-sgi-movie	mp2	audio/x-mpeg	mp3	audio/x-mpeg
mp4	video/mp4	mpc	application/vnd.mpohun.certificate	mpe	video/mpeg
mpeg	video/mpeg	mpg	video/mpeg	mpg4	video/mp4
mpga	audio/mpeg	mpn	application/vnd.mophun.application	mpp	application/vnd.ms-project
mps	application/x-mapserver	mrl	text/x-mrml	mrm	application/x-mrm
ms	application/x-troff-ms	mts	application/metastream	mtx	application/metastream
mtz	application/metastream	mzv	application/metastream	nar	application/zip
nbmp	image/nbmp	nc	application/x-netcdf	ndb	x-lml/x-ndb
ndwn	application/ndwn	nif	application/x-nif	nmz	application/x-scream
nokia-op-logo	image/vnd.nok-oplogo-color	npx	application/x-netfpx	nsnd	audio/nsnd
nva	application/x-neva1	oda	application/oda	oom	application/x-AtlasMate-Plugin
pac	audio/x-pac	pae	audio/x-epac	pan	application/x-pan
pbm	image/x-portable-bitmap	pcx	image/x-pcx	pda	image/x-pda
pdb	chemical/x-pdb	pdf	application/pdf	pfr	application/font-tdpfr
pgm	image/x-portable-graymap	pict	image/x-pict	pm	application/x-perl
pmd	application/x-pmd	png	image/png	pnm	image/x-portable-anymap
pnz	image/png	pot	application/vnd.ms-powerpoint	ppm	image/x-portable-pixmap
pps	application/vnd.ms-powerpoint	ppt	application/vnd.ms-powerpoint	pqf	application/x-cprplayer
pqi	application/cprplayer	prc	application/x-prc	proxy	application/x-ns-proxy-autoconfig
ps	application/postscript	ptlk	application/listenup	pub	application/x-mspublisher
pvx	video/x-pv-pvx	qcp	audio/vnd.qcelp	qt	video/quicktime
qti	image/x-quicktime	qtif	image/x-quicktime	r3t	text/vnd.rn-realtext3d
ra	audio/x-pn-realaudio	ram	audio/x-pn-realaudio	rar	application/x-rar-compressed
ras	image/x-cmu-raster	rdf	application/rdf+xml	rf	image/vnd.rn-realflash
rgb	image/x-rgb	rlf	application/x-richlink	rm	audio/x-pn-realaudio
rmf	audio/x-rmf	rmm	audio/x-pn-realaudio	rmvb	audio/x-pn-realaudio
rnx	application/vnd.rn-realplayer	roff	application/x-troff	rp	image/vnd.rn-realpix
rpm	audio/x-pn-realaudio-plugin	rt	text/vnd.rn-realtext	rte	x-lml/x-gps
rtf	application/rtf	rtg	application/metastream	rtx	text/richtext
rv	video/vnd.rn-realvideo	rwc	application/x-rogerwilco	s3m	audio/x-mod
s3z	audio/x-mod	sca	application/x-supercard	scd	application/x-msschedule
sdf	application/e-score	sea	application/x-stuffit	sgm	text/x-sgml
sgml	text/x-sgml	sh	application/x-sh	shar	application/x-shar
shtml	magnus-internal/parsed-html	shw	application/presentations	si6	image/si6
si7	image/vnd.stiwap.sis	si9	image/vnd.lgtwap.sis	sis	application/vnd.symbian.install
sit	application/x-stuffit	skd	application/x-Koan	skm	application/x-Koan
skp	application/x-Koan	skt	application/x-Koan	slc	application/x-salsa
smd	audio/x-smd	smi	application/smil	smil	application/smil
smp	application/studiom	smz	audio/x-smd	snd	audio/basic
spc	text/x-speech	spl	application/futuresplash	spr	application/x-sprite
sprite	application/x-sprite	spt	application/x-spt	src	application/x-wais-source
stk	application/hyperstudio	stm	audio/x-mod	sv4cpio	application/x-sv4cpio
sv4crc	application/x-sv4crc	svf	image/vnd	svg	image/svg-xml
svh	image/svh	svr	x-world/x-svr	swf	application/x-shockwave-flash
swfl	application/x-shockwave-flash	t	application/x-troff	tad	application/octet-stream
talk	text/x-speech	tar	application/x-tar	taz	application/x-tar
tbp	application/x-timbuktu	tbt	application/x-timbuktu	tcl	application/x-tcl
tex	application/x-tex	texi	application/x-texinfo	texinfo	application/x-texinfo
tgz	application/x-tar	thm	application/vnd.eri.thm	tif	image/tiff
tiff	image/tiff	tki	application/x-tkined	tkined	application/x-tkined
toc	application/toc	toy	image/toy	tr	application/x-troff
trk	x-lml/x-gps	trm	application/x-msterminal	tsi	audio/tsplayer
tsp	application/dsptype	tsv	text/tab-separated-values	tsv	text/tab-separated-values
ttf	application/octet-stream	ttz	application/t-time	txt	text/plain
ult	audio/x-mod	ustar	application/x-ustar	uu	application/x-uuencode
uue	application/x-uuencode	vcd	application/x-cdlink	vcf	text/x-vcard
vdo	video/vdo	vib	audio/vib	viv	video/vivo
vivo	video/vivo	vmd	application/vocaltec-media-desc	vmf	application/vocaltec-media-file
vmi	application/x-dreamcast-vms-info	vms	application/x-dreamcast-vms	vox	audio/voxware
vqe	audio/x-twinvq-plugin	vqf	audio/x-twinvq	vql	audio/x-twinvq
vre	x-world/x-vream	vrml	x-world/x-vrml	vrt	x-world/x-vrt
vrw	x-world/x-vream	vts	workbook/formulaone	wav	audio/x-wav
wax	audio/x-ms-wax	wbmp	image/vnd.wap.wbmp	web	application/vnd.xara
wi	image/wavelet	wis	application/x-InstallShield	wm	video/x-ms-wm
wma	audio/x-ms-wma	wmd	application/x-ms-wmd	wmf	application/x-msmetafile
wml	text/vnd.wap.wml	wmlc	application/vnd.wap.wmlc	wmls	text/vnd.wap.wmlscript
wmlsc	application/vnd.wap.wmlscriptc	wmlscript	text/vnd.wap.wmlscript	wmv	audio/x-ms-wmv
wmx	video/x-ms-wmx	wmz	application/x-ms-wmz	wpng	image/x-up-wpng
wpt	x-lml/x-gps	wri	application/x-mswrite	wrl	x-world/x-vrml
wrz	x-world/x-vrml	ws	text/vnd.wap.wmlscript	wsc	application/vnd.wap.wmlscriptc
wv	video/wavelet	wvx	video/x-ms-wvx	wxl	application/x-wxl
x-gzip	application/x-gzip	xar	application/vnd.xara	xbm	image/x-xbitmap
xdm	application/x-xdma	xdma	application/x-xdma	xdw	application/vnd.fujixerox.docuworks
xht	application/xhtml+xml	xhtm	application/xhtml+xml	xhtml	application/xhtml+xml
xla	application/vnd.ms-excel	xlc	application/vnd.ms-excel	xll	application/x-excel
xlm	application/vnd.ms-excel	xls	application/vnd.ms-excel	xlt	application/vnd.ms-excel
xlw	application/vnd.ms-excel	xm	audio/x-mod	xml	text/xml
xmz	audio/x-mod	xpi	application/x-xpinstall	xpm	image/x-xpixmap
xsit	text/xml	xsl	text/xml	xul	text/xul
xwd	image/x-xwindowdump	xyz	chemical/x-pdb	yz1	application/x-yz1
z	application/x-compress	zac	application/x-zaurus-zac	zip	application/zip
dotx	application/vnd.openxmlformats-officedocument.wordprocessingml.template	docx	application/vnd.openxmlformats-officedocument.wordprocessingml.document	xlsx	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet